28104455 has 4 divisors (see below), whose sum is σ = 33725352. Its totient is φ = 22483560.

The previous prime is 28104437. The next prime is 28104463. The reversal of 28104455 is 55440182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28104455 - 2⁸ = 28104199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810441 + ... + 2810450.

It is an arithmetic number, because the mean of its divisors is an integer number (8431338).

Almost surely, 2^28104455 is an apocalyptic number.

28104455 is a deficient number, since it is larger than the sum of its proper divisors (5620897).

28104455 is an equidigital number, since it uses as much as digits as its factorization.

28104455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620896.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 28104455 is about 5301.3635038545. The cubic root of 28104455 is about 304.0360320576.

The spelling of 28104455 in words is "twenty-eight million, one hundred four thousand, four hundred fifty-five".